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Published byClinton Hart Modified over 9 years ago
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NORMANOCH ASSOCIATION AQUATIC PLANT MANAGEMENT PLAN 2015
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HARVESTING HERBICIDE Harvesting partially removes aquatic weed mass but only small amount of Phosphorus and Nitrogen. Alleviates boating lane obstruction in Stehr and Myrtle channels in response to complaints Causes silt disruption due to turbulence in shallow areas causing spread of nutrients. Is inefficient and costly =/>$10,000/year Fragmentation and loose cuttings have spread Eurasian Water Milfoil into main body of the lake. Most lakes are abandoning harvesting for above reasons. Use of herbicides is a first for NA in managing aquatic weeds Unknown numbers of water consumers - but none along Stehr tract –they have their own water supply system Emotional and strong feelings of some members against its use. Must help them understand. Cost effective – systemic will have up to a 3 year effectiveness saving $20,000 in Sterh Tract Sonar (Fluridone) for Stehr Tract Clipper for EWM in selected lake areas. Consultant 100% supportive of plan since plan is < 10% of lake area. Herbicides used widely at other lakes Owassa, Kittitiny, Mohawk, Mountain. Owassa has water consumers also. Totally biodegrades
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EWM INFESTATION AREAS Stehr Tract Approximate area to apply herbicide 25 acres. Very dense EWM between Alfano’s and entrance to Blue Ribbon Some areas of Stehr Tract will be exposed in fall drawdown but not area of EWM. Suitable for Systemic type (Sonar) Lake Areas North Shore –about 3 acres Causeway Cove – about 6 acres Dam Cove – about 4 acres West Shore – about 2 acres Total area approx. 15 acres Suitable for Contact type (Clipper)
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RECOMMENDATION 1 Notify members by letter Invite to a meeting in February or March to ask questions Test Treat the 25 acre Sterh Tract area with a systemic product called Sonar. Two 15 ppb treatments over 2 week period. Only irrigation restriction Will be effective control for 2-3 years Minimize or eliminate harvesting. Lake drawdown will help shallower areas.
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RECOMMENDATION 2 Apply a contact product, Clipper to control EWM in selected areas in the lake proper, i.e. the North Shore, West Shore, Causeway, or Dam coves in heavily infested areas. This will provide some degree of control over EWM. A survey in July will provide valuable information for a future decision making in 2016. Clipper is a contact product that has takes very little time (2 days) to knock down the weeds. It too has no water use restrictions except irrigation. Clipper is a proven effective and fast acting control of EWM
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BUDGET COSTS FOR CONTROLLING EWM Sonar for Stehr Tract $12,000 for 25 Acres Total Cost for both treatments$22,000 Clipper for Spot treatment $690/acre $10,000 for 15 acres
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